Sound-reflecting device for tauking machines



Feb. 0, 1925. 1,526,254

6. STlLLE SOUND REFLECTING DEVICE FOR TALKING MACHINES Filed Sept. 25- 192;

Patented Feb. 10, 1925.

GURT STILLE, OF BERLIN-ZEHLENBORF,

GERMANY, ASSIGNOR TO TELEGRAPHIE- GESELLSGH AFT MIT BESCHRANKTER HAFTUNG SYSTEM STILLE, OF BERLIN, GER- MANY.

SOUND-REFLECTITQT C- Application filed September 25, 1922.

To all whom it may concern:

Be it known that I, CURT STILLE, a citizen of the German Republic, residing at Berlin-Zehlendort, Germany, have invented certain new and useful Improvements in Sound-Reflecting Devices -for Talking Machines, of which the following is a specification.

This invention relates to a talking machine 01" the kind in which the sound is led by the tone arm into a motor cabinet and propagated from the latter by means of an angular, vertically disposed sound reflector.

The object of the invention is to secure the greatest possible sound amplification concomitant with the restricted space available, and the invention consists in arranging the reflector on a sound board opposite a horn whose outer edges are deeply indented or scalloped so that, by placing the apex of the reflector close to the horn in two diametrically opposed indentations, the horn can be of substantial size whilethe indentations allow an undainped propagation of the sound.

Preferably, in order to make the best possible use of the cabinet space, the horn is arranged so as to project diagonally from one corner of the cabinet, the reflector being arranged across the opposite corner. The horn may be of substantiall square crosssection and termed with one indentation at each side.

Fig. l of the accompanying drawings represents a side view of the arrangement, and

Fig. 2, a plan of the same.

The motor cabinet 1 of the talking machine contains an angular, vertical reflector 6 which is arranged on a sound board 7 across one corner of the cabinet. Projecting diagonally from the opposite corner of the cabinet is a horn 3 which receives the sound from the tone arm :2 and emits the waves onto the reflector. The outer edges of the horn are deeply indented or scalloped, and the arrangement is such that the apex of the reflector is situated close to the horn in two diametrically opposed indentations.

By arranging the reflector on a sound DEVICE FOR TALKING I'Y'EACEINES.

Serial No. 590,423.

board, its vibrations will be considerably amplified, and the relation of horn and reflector is such that the horn can be of substantial size without occupying too much space, while the indentations allow the sound waves to be propagated by the reflector without impedance and distortion.

The horn is preferably of substantially square cross-section and formed with one indentation at each side. The reflector is placed in the indentations 4t of the hori zontal sides, while the indentations 5 of the vertical sides provide unobstructed passage for the sound waves.

I claim:

1. In a talking machine cabinet oi the character described, the combination with an angular, vertical reflector, of a sound board supporting said reflector, and a horn having deeply indented outer edges and be ing situated close to the reflector with the apex of the latter disposed in two diametrically opposed indentations.

2. In a talking machine cabinet of the character described, the combination with an angular, vertical reflector arranged across one corner of the cabinet, of a sound board supporting said reflector, and a horn aranged so as to project diagonally from the opposite corner of the cabinet, the horn being provided with deeply indented outer edges and situated close to the reflector with the apex of the latter disposed in two diametrically opposed indentations.

3. In a talking machine cabinet of the character described, the combination with an angular, vertical r flector arranged across one corner of the cabinet, of a sound board supporting said reflector, and a horn of substantially square cross-section arranged so as to project diagonally from the opposite corner of the cabinet, each side of the horn being formed with a deep indentation in its outer edge, the reflector being arranged close to the horn with its apex in two diametrically opposed indentations.

CURT STILLE. 

